کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9674277 | 1453202 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Kinetics of degradation of sulphur mustard on impregnated carbons
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
Kinetics of degradation of sulphur mustard (HD) on the surface of NaOH/CrO3/C, NaOH/CrO3/EDA/C and RuCl3/C systems has been examined by using gas chromatography technique by extracting and analyzing the residual HD periodically. The carbons were prepared by impregnating activated carbon with 4% sodium hydroxide plus 3% Cr(VI) as CrO3 with and without 5% ethylene diamine (EDA) and 5% ruthenium chloride by using their aqueous solutions. Obtained carbons were characterized for surface area analysis by BET conventional method. Kinetic plots reveal that the observed reactions are fast at the initial stages, slow at the later stages and progress to a steady state indicating the first order behavior. Effect of moisture on kinetic rate is also observed. In the case of NaOH/CrO3/C system the rate constant is decreased from 13.36 to 5.53Â ÃÂ 10â2Â hâ1 and half life is increased from 5.2 to 12.54Â h while moisture content is increased from 1.9% to 11.2%. Whereas, the rate constant of HD degradation reaction is decreased from 10.4 to 4.14Â ÃÂ 10â2Â hâ1 and half life is increased from 6.7 to 16.72Â h while moisture content is increased from 2.1% to 10.8% on NaOH/CrO3/EDA/C. Reaction on RuCl3/C system also behaves in the similar manner. Extracted reaction products were characterized by GC/MS and it is found that on NaOH/CrO3/C, HD degrades to hemisulphur mustard, thiodiglycol and 1,4-oxathiane. Whereas, on NaOH/CrO3/EDA/C, HD is degraded to 1,4-thiazane and it is degraded to divinyl sulphone on RuCl3/C. All these investigations reveal that above mentioned carbons can be used in nuclear, biological and chemical (NBC) filtration systems for protection against sulphur mustard.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 121, Issues 1â3, 20 May 2005, Pages 159-165
Journal: Journal of Hazardous Materials - Volume 121, Issues 1â3, 20 May 2005, Pages 159-165
نویسندگان
G.K. Prasad, Beer Singh, M.V.S. Suryanarayana, B.S. Batra,